All practice questions

Glaciologist Dr. Hiroshi Tanaka investigated the impact of windborne dust on glacier melting in the Southern Alps. Tanaka hypothesized that dust particles originating from neighboring agricultural fields deposit onto glacier surfaces, lowering the glaciers' albedo—their capacity to reflect solar radiation—and consequently accelerating surface melting during the summer. To test this hypothesis, Tanaka's team monitored several glaciers, measuring both surface dust concentration and reflectivity alongside local temperature changes. Which choice, if true, would most directly support Tanaka's hypothesis?

Which choice completes the text with the most logical and precise word or phrase?

Leafcutter ants (*Atta cephalotes*) do not eat the leaves they harvest. Instead, they transport the cut vegetation to subterranean nests, where they use it as a substrate to cultivate a specific species of fungus (*Leucoagaricus gongylophorus*). The ants feed exclusively on this cultivated fungus, which in turn relies on the fresh leaves brought by the ants for its growth. The relationship is mutually beneficial, as the fungus provides nutrition for the ants, and the ants provide a steady supply of nutrients and protect the fungus from harmful pathogens. According to the text, what do leafcutter ants use the harvested leaves for?

In cognitive science, researchers have investigated how spatial navigation strategies vary across different cultures. While individuals from urban environments with grid-like street layouts tend to rely on coordinate-based mental maps, those from areas with irregular layouts often use landmark-based navigation. To understand the origins of these differences, a team led by Dr. Julian Sterling analyzed navigation patterns in over four thousand participants from diverse geographic regions. The team found that the structural complexity of a participant's hometown directly predicted their preference for specific navigational strategies. Thus, spatial cognitive habits are not entirely innate but are significantly shaped by the physical architecture of the environments we inhabit.

Which choice best describes the function of the underlined sentence in the text as a whole?

For decades, linguists have struggled to classify Basque, a language isolate with no known relatives, often relying on speculative links to Caucasian or Afroasiatic language families to explain its unique structure. Recently, however, archaeogenetic research has provided a new perspective on this enigma. By analyzing ancient DNA from the Iberian Peninsula, researchers demonstrated that modern Basque speakers share a high genetic affinity with Bronze Age populations, rather than representing an unmixed Paleolithic remnant as previously hypothesized. This genetic continuity suggests that while the Basque language successfully resisted Indo-European replacement, its speakers were not biologically isolated. Consequently, scholars are increasingly shifting their focus from futile attempts at tracing distant linguistic genealogies to understanding the social and ecological factors that allowed the language to survive amid widespread cultural transitions.

Which choice best states the main purpose of the text?

Sociologist Dr. Clara Vance and her team investigated the impact of community gardens on neighborhood cohesion in urban areas. Vance hypothesized that neighborhoods with active community gardens experience higher levels of social interaction among residents than neighborhoods without such gardens. Which finding, if true, would most directly support Vance's hypothesis?

Ecologist Dr. Nia Mshila and colleagues investigated the phenotypic plasticity of the marine snail *Nucella lapillus* in response to predatory cues from the green crab *Carcinus maenas*. In calm waters, snails exposed to crab effluents typically develop significantly thicker shells to resist crushing. However, Mshila hypothesized that in habitats characterized by high wave action, *N. lapillus* will prioritize shell shape (developing a wider aperture for stronger foot attachment to rocks) over shell thickness, even when exposed to crab cues, because hydrodynamic dislodgement poses a more immediate survival threat than predation. Which finding, if true, would most directly support Mshila's hypothesis?

Ancient Roman marine concrete has survived for over two millennia in seawater, whereas modern concrete degrades within decades under similar conditions. Researchers found that the Romans mixed volcanic ash and lime with seawater, forming a mineral called aluminous tobermorite. This mineral crystallizes within the concrete, strengthening the structure over time and preventing cracks. Because modern concrete lacks volcanic ash, it does not form this mineral when exposed to seawater. Therefore, the exceptional durability of Roman marine concrete is largely attributable to ______

Which choice most logically completes the text?

Though many nineteenth-century critics dismissed Mary Shelley’s *Frankenstein* as a sensationalist gothic romance, contemporary scholars recognize that the novel’s engagement with the scientific debates of its era was far from ________. Shelley did not merely employ scientific concepts as decorative elements to heighten the story's suspense; rather, her narrative carefully interrogates the ethical limits of galvanism and early anatomy, reflecting a sophisticated understanding of contemporary natural philosophy.

Which choice completes the text with the most logical and precise word or phrase?

For decades, biologists debated why zebras have distinctive black-and-white stripes, suggesting hypotheses ranging from camouflage in tall grass to social bonding. Recent research by Caro and colleagues, however, suggests a more practical explanation: the stripes deter biting flies. By observing horses dressed in striped coats and comparing them to undecorated horses, researchers found that horseflies flew toward both targets at similar speeds but failed to decelerate properly before landing on the striped surfaces, often bouncing off instead. This indicates that the contrasting pattern disrupts the flies' visual systems during their final approach, offering zebras an evolutionary advantage against disease-carrying insects.

Which choice best states the main purpose of the text?

In behavioral ecology, researchers have long debated whether non-human animals exhibit cognitive biases similar to human loss aversion—the tendency to prefer avoiding losses over acquiring equivalent gains. Some evolutionary models suggest that under resource-scarce conditions, prioritizing risk mitigation is highly adaptive, predicting that animals should show strong aversion to perceived losses. To test this hypothesis, biologist Dr. Kenji Tanaka and his team designed an experiment in which capuchin monkeys (*Cebus apella*) chose between a guaranteed food reward and a risky option with a fluctuating payoff. The monkeys consistently preferred the guaranteed rewards, even when the expected value of the risky option was mathematically superior. This finding suggests that cognitive heuristics minimizing loss are deeply rooted in evolutionary history rather than being unique products of human cultural or economic systems.

Which choice best describes the function of the underlined sentence in the text as a whole?

In temperate rainforests, fallen trees, or 'nurse logs,' serve a critical role in forest regeneration. As these large logs decay on the forest floor, they accumulate moisture and nutrients, providing a hospitable substrate for seedlings, particularly Western hemlock. This substrate is especially vital because the dense moss and organic debris on the forest floor often prevent seeds from making contact with the mineral soil, leading to high seedling mortality. By germinating on nurse logs, seedlings can access light and avoid pathogens residing in the forest floor soil. Thus, nurse logs act as essential nurseries that facilitate the survival and growth of new trees, shaping the structural diversity of the forest over time.

Which choice best states the main idea of the text?

Which choice completes the text with the most logical and precise word or phrase?

For decades, entomologists attributed the division of labor among honeybee workers—such as transitions from nursing larvae to foraging outside the hive—solely to chronological age. However, researcher Gene Robinson and his team challenged this paradigm by demonstrating that behavioral transitions are accompanied by rapid, reversible modifications in brain gene expression. They observed that when hives lacked older foragers, young bees accelerated their development, displaying neural gene activity profiles indistinguishable from mature foragers. Robinson proposed that social cues regulate endocrine levels, which in turn alter DNA accessibility. This epigenetic mechanism suggests that social structure actively coordinates collective behavior by modifying individual genetic readouts rather than relying on a fixed internal clock.

Which choice best describes the overall structure of the text?

The sociable weaver (*Philetairus socius*), a bird species native to Southern Africa, constructs the largest nests of any bird. These communal structures, which can house up to one hundred nesting pairs, are built primarily from twigs, dry grass, and straw. Researchers have observed that the inner chambers of these nests retain heat during cold desert nights, maintaining a temperature significantly higher than the ambient air outside. Furthermore, the birds populate the central chambers of the nest first because these areas provide the greatest insulation against the cold, whereas the outer chambers are occupied only when the inner chambers are fully populated.

According to the text, which statement is true about the nesting behavior of the sociable weaver?

Gerardus Mercator’s 1569 world map is frequently censured by modern educators for distorting the relative scale of landmasses, notably exaggerating high-latitude regions while shrinking equatorial zones. However, evaluating the projection through the lens of modern geographic accuracy misconstrues Mercator’s design intent; his primary objective was to resolve a critical navigational challenge of the age of sail. By projecting lines of constant bearing—loxodromes—as straight coordinates, Mercator enabled mariners to plot a course simply by drawing a line between two points and measuring the angle relative to the meridians. Consequently, the projection's distortion of area was not a structural failure, but a necessary mathematical compromise designed to serve a highly specialized nautical function rather than an educational overview.

Which choice best states the primary purpose of the text?

Sociologist Dr. Evelyn Choi investigated the relationship between 'third places'—communal spaces separate from home and work—and community resilience in urban neighborhoods. Choi hypothesized that neighborhoods containing third places that facilitate regular, active interaction among different age groups (such as multigenerational community gardens) exhibit greater social cohesion during environmental crises than neighborhoods with third places that cater primarily to a single demographic group (such as youth centers or senior clubs). Which finding, if true, would most directly support Choi's hypothesis?

For decades, Mayanist scholars believed that Maya hieroglyphs were purely logographic—representing whole words or ideas without phonetic components—and could not be read phonetically. In the 1950s, linguist Yuri Knorozov challenged this consensus by proposing that the script was logosyllabic, combining both logograms and phonetic signs that represented syllables. By comparing historical descriptions of Maya words with surviving glyphs, Knorozov demonstrated that many signs represented consonant-vowel combinations. Although initially met with skepticism from prominent western Mayanists who dismissed his work, Knorozov's phonetic approach eventually became the foundation for modern decipherment, fundamentally transforming our understanding of Maya history.

Which choice best states the main purpose of the text?

In marine biology, the study of bioluminescent organisms has revealed unique survival adaptations in deep-sea ecosystems. Some species of jellyfish emit flashes of light to startle predators, allowing them time to escape. For example, the species *Aequorea victoria* produces a green glow when threatened by larger fish. By understanding these individual mechanisms, scientists can better analyze the overall food web dynamics in the darkest zones of the ocean.

Which choice best describes the function of the underlined sentence in the text as a whole?

Although nineteenth-century reform movements in Europe and North America championed public parks as essential tools for improving public health and reducing social unrest, historians have noted that these green spaces often had a more complex, double-edged impact. While parks provided clear recreational benefits to some residents, their construction frequently required the displacement of working-class neighborhoods and low-income communities. Consequently, the establishment of these parks did not simply resolve urban tensions; rather, it ______ them by relocating marginalized populations and creating new patterns of spatial inequality.

Which choice completes the text with the most logical and precise word or phrase?